Webster's Revised Unabridged Dictionary · 1913

Foy

Foy (foi) , noun

[French foi, old spelling foy, faith. See Faith.]

1.
Faith; allegiance; fealty. [Obsolete] — Spenser
2.
A feast given by one about to leave a place. [Obsolete]
He did at the Dog give me, and some other friends of his, his foy, he being to set sail to-day. — Pepys